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커피원두 보관,
4가지만 주의하자!

생두는 바람이 통하는 음지에서 잘 보관한다면 1년이 넘게 보관할 수 있습니다. 하지만 로스팅이 끝난 커피 원두는 시간이 지날수록 커피가 가진 풍미를 잃기때문에(산패현상), 많은 분들이 로스팅 후 2일~7일 사이의 커피가 가장 맛있다고 이야기하죠.

하지만 얼마나 보관을 잘 하느냐에 따라 로스팅 후 3~4일만에 커피맛이 별로일 수도 있고, 2주가 넘은 원두커피가 맛있을 수도 있습니다. 원두 보관에서 가장 중요한 4가지요소를 지금부터 알려드립니다!

(함께 읽기 좋은 기사 : [궁금하면 찾아보는 커피백과사전]  원두 보관 방법 )


#1. 온도

원두를 보관하는 곳의 온도가 높아질수록 원두는 빨리 산패되면서 커피의 맛을 잃게 됩니다. 하지만 이를 예방하기위해 일반 가정용 냉장고에 보관하는 것도 적절하지 않습니다. 가정에서 사용되는 냉장고는 문을 여닫을 때마다 생기는 온도차이로 원두에 성에가 생길 수 있고, 냉장고 안의 다른 음식들에서 발생하는 악취가 커피에 흡착되어 커피 맛에 나쁜 영향을 줄 수 있습니다.

이를 개선하기 위해 일부 바리스타들은 1~2회 분량으로 분리포장한 후 냉동실에 얼리는 경우도 있지만, 냉동실에서 꺼낸 원두를 그라인더까지 옮기는 거리가 길수록 차가웠던 커피원두가 따뜻한 공기와 만나면서 머금은 습기로 인해 그라인더 내부에서 뭉칠 수 있으니 조심하세요.

(함께 읽기 좋은 기사 : 분쇄도 관리, 원두를 얼려보면 어떨까? )


#2. 산소

원두 산패의 중요한 요인 중 하나가 바로 산소입니다. 로스팅 직후에는 원두 내부에 가스를 가지고 있어 산소가 침투하는 것을 방지할 수 있지만, 시간이 지나면서 가스가 방출되면서 생기는 빈 공간을 공기(산소)가 차지하면서 산패현상이 생기게 됩니다.

이를 예방하는 방법으로는 캔에 담아 질소포장하거나, 원두 속 가스는 배출하면서 산소 유입은 억제할 수 있는 ‘원웨이 밸브’를 사용합니다.


#3. 습도

생두가 가지고있던 수분은 로스팅 과정에서 수증기로 배출되면서(파핑), 원두의 수분 함량은 매우 낮아지게 됩니다. 하지만 방치된 원두는 다공질의 조직이 공기 중의 수분을 흡수하면서 산패될 수 있습니다. 이를 예방하기 위해서는 낮은 습도를 유지한 상태에서 밀봉/보관하는 것이 필요합니다.


#4. 시간

서두에서 말씀드린 것처럼 아무리 잘 보관한 원두라도 시간이 지날수록 원두 플레이버는 점점 사라지게 됩니다. 질소냉동 등의 특수한 보관법을 사용하지 않는다면, 구매한 원두는 가급적 빨리 사용하는 것이 맛있는 커피를 즐길 수 있는 최선의 방법입니다.

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